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Decolourization and modelling of synthetic waste-water by O3 and H2O2/O3 process [Elektronski vir]
Bauman, Maja ; Lobnik, Aleksandra ; Hribernik, Aleš, 1960-
This research deals with decolourization of synthetic waste-water prepared with acid 1:2 metal complex textile dye C.I. Acid Blue 193 by ozonation (O3) and H2O2/O3 process was investigated. In order ...to minimize the number of experiments, experiments were performed using the 2k factorial design. Five influential parameters were examined: initial dye concentration, ozone flow rate, initial pH value, decolourization time and H2O2 addition. The decolourization efficiency was 95% in 20 minutes (pH = 7; O3 flow rate 2 g/h). According to the variance test analysis, initial dye concentration, ozone flow rate, initial pH value and decolourization time and their first and second order interactions are significant, while the H2O2 addition was not important over the discussed range. With the help of significant factors a regression model was constructed and model adequacy checked. The obtained regression polynomial was used to model the relation between absorbance and influential parameters by fitting the response surface. Response surface may be used to predict absorbance resulted from a set of influential parameters, or it can be rearranged in such a way to predict the set of process decolourization parameters necessary to reduce the absorbance of waste water with the given initial dye concentration below the prescribed limit. It is also shown that 2k factorial design can be suitable to predict ozonation operating expenses.
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